Weighing scale



Pl J. FLVVKJPJS WEIGHING SCALE July `1 3, 1937@ Filed July 21, 1956 gmIf. J: Hau/m Patented July 13, 1937 UNITED STATES PATENT OFFICE 2Claims.

This invention relates to a scale mechanism or balance and itparticularly aims to provide a construction which will operate withminimum friction and wear of the parts.

More particularly it is aimed to provide a construction wherein theweight through the medium of a float, is translated to mercury which inturn actuates a registering mechanism.

The more specific objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawing illustrating an operative embodiment.

In said drawing:-

Figure l is a view of the scales in side elevation;

Figure 2 is a section taken on the line 2 2 of Figure 1;

Figure 3 is a section taken on the line 3 3 of Figure 2, and

Figure 4 is a section taken on the line 4-4 of Figure 2.

Referring specifically to the drawing wherein like reference charactersdesignate like or similar parts, a scale platform is shown at IG, poisedor fulcrumed at I I and I2, upon lever beams l 3 and I4, respectively.The lever I3 is pivoted at one end as at I5 to a suitable support andthe lever I4 at I6, is pivoted at one end to a suitable support, itsother end carrying a fulcrum piece Il, with which the lever I3 contacts.

One end, namely the free end of the beam lever I3 is bifurcated or ofU-shape as at i8 and depending from the arms thereof one adjacent eachfree end of each arm, are pegs I9 having their lower ends pointed asshown at 2U.

A receptacle is shown at 2l adapted to contain mercury as at 22. Asuitable float, preferably metallic, is shown at 23, engaging thesurface of the mercury 22 and such float has Wells 24 therein with thebottom of which the conical points 20 are adapted to Contact. The pegsE9 are of substantially less cross sectional area as the space withinthe wells 211 so that the pegs t the wells without freedom toV movelaterally therein.

A stand pipe 25 is secured in the receptacle 2i equidistantly betweenthe pegs I9 and at the lower portion has an opening 26 so that themercury may ow interio-rly of the stand pipe. From the top of the standpipe, an indicating tube 2l rises, such tube preferably being of glassand having its lower end portion as at 28, suitably secured water tightto the stand pipe. Within the stand pipe and a portion of the indicatortube 2l, a body of liquid 29 is provided. Such liquid is of lighterspecic gravity than the mercury and is adapted to rise in the tube 2l asthe mercury is displaced through the depression of the float 23.Calibrations at 3l) are provided on the tube 2l, proportioned to therise of the fluid 29, occasioned by the depression of the float, toindicate weight. It is clear that the fluid 29 may be colored, ifdesired.

In the use of the device, the material to be weighted is placed upon theplatform i0 and in proportion to such weight, the platform reacts on thebeam levers i4 and i3, causing the pegs I9 to descend, pushing the float23 downwardly, displacing the mercury somewhat causing it to rise withinthe stand pipe and in turn to elevate the fluid 29 se as to properlycoact with the calibrations li to indicate the Weight. 15

Attention is called to the fact that the points of the pegs at 26 reducefriction and the location of the points applies the pressure of thelever beam to the oat below the center of the float to insure equalsubmersion of both sides of the float 20 relative to the mercury.

Various changes may be resorted to provided they fall within the spiritand scope of the invention.

I claim as my invention:-

1. Apparatus of the class described having a lever eam depressible byweight superposed thereon, said lever beam at its free end beingbifurcated, pegs depending from the arms of the bifurcation, a containerfor mercury, a stand 30 pipe in the receptacle open to the flow ofmercury, a float surrounding said stand pipe and engaging the mercury,wells depending from the top of the iloat on opposite sides of the standpipe, said pegs at their lower ends engaging the float below the centerof the latter, an indicator tube leading from the stand pipe, and aliquid lighter than mercury operable by the latter to indicate in saidtube.

2. Apparatus of the class described having a 40 lever beam depressibleby weight superposed thereon, said lever beam at its free end beingbifurcated, pegs depending from the arms of the bifurcation, a containerfor mercury, a stand pipe in the receptacle open to the flow of mer- 45cury, a float surrounding said stand pipe and engaging the mercury, saidpegs at their lower ends engaging the float below the center of thelatter, an indicator tube leading from the stand pipe, and a liquidlighter than mercury operable by the latter to indicate in said tube,said float having wells depending from the top thereof in which the pegsextend, said pegs being of less diameter than the interior diameter ofthe wells, and said pegs having pointed lower ends 55 engaging the basewalls of the wells.

HAROLD J. HAWKINS.

